Island



(No Model.)

J. LEDWARD.

SAW.

No. 325.679. Patented Sept. 8, 1885.

ILeJZI/QM WITNESSES; fl mum/ml? & 3

r A Horne ya N. PETERS. Photo-Lithognpher. Wflshinglun. D. C.

UNITED STATES ATnNT FFICEO JOSEPH LEDWAR-D, OF \VESTERLY, RHODE ISLAND.

SPECIFICATION forming part of Letters Patent No. 325,679,dated September8, 1885.

Anplica tion filed January 29, 1885.

To all whom it may concern.-

Be it known thatI, J osnrrr Lnnwann, a citizen of the United States,residing at W'esterly, in the county of \Vashington and State of RhodeIsland, have invented a new and useful Improvement in Saws, of which thefollowing is aspecification, reference being had to the accompanyingdrawings.

lhis invention relates to saws, and is specially designed as an'improveinent on the construction shown, described, and claimed in anapplication for Letters Patent, Serial No. 133,082, filed by me May 27,188i, and allowed August 12, 1884.

In this application the improvement consists in forming theplaning-irons integral with the teeth of an crdinary saw, said ironsprojecting out from the face of the tooth beyond the line of the blade.In all of the planingsaws which have come to my notice the planing-ironprojects out either from the blade or from the teeth beyond the line ofthe blade, and thus the kerf made will be greater than it is desired.

The object of the present invention is to ob viate this objection; andit consists in forming the planing-irons with the teeth by pressing outone side of the latter, said teeth being of thinner steel than theblade, and the cuttingedge of the planing-iron being on a line with theface or side of the blade, whereby I am enabled to provide a planing sawwhich will make about the same kerf or slit as the ordinary saw.

A further object of the present improvement is to provide an improvedmanner of constructing the removable saw-tooth, so that the possibilityof displacement will be lessened to a considerable degree, andsimplifying the attachment in many respects.

With these objects in view the said invention consists in the improvedconstruction and combination of parts, as hereinafter set forth, andparticularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective view of aportion of a circular saw blade with my improvement applied thereto.Fig. 2 is a similar view, showing the teeth with the planing-irondetached from their seats. Fig. 3 is a horizontal section on (No model.)

the line a m, Fig. 1. Fig. 4 is a vertical section on the line y y, Fig.1.

Like letters are used to indicate corresponding parts in the severalfigures.

Referring to the drawings, A designates a portion of a saw -blade havingrecesses B formed therein at the outer edge or periphery to provideseats for the teeth. These recesses are formed alternately on oppositesides of the blade, and at such intervals apart as to corre spend withthe arrangement and number of the teeth. The shape of the recesses ispreferably square, having the opposite sides dove tailed, as at a a, thebottom wall being flat and the top wall being open to allow theintroduction of the shank of the tooth. As will be seen, the recesses donot extend entirely through the blade, but provide a closed wall, 12,against which the shank of the tooth rests when adjusted in position,

0 designates the teeth, made of thinner steel than the blade, and havingtheir shanks D dovetailed or beveled on their sides 61 d, so as to heslid downward into the seats provided by the recesses 13, the dovetailedor beveled sides of the shanks fitting neatly the dovetailed sides ofthe recesses, and thus providing a simple, durable, and eiiicientconnection between the teeth and the blade, and entirely avoiding anysidewise or lateral movement of the teeth. A screw, E,(one or more,) ispassed through the shank D at the sides d into the wall I) of the recessB, to strengthen the attachment or connection and provide againstoutward or upward movement of the teeth.

The teeth 0 are pressed out on one side, between the shanks D and theprojecting cuttingedge of the tooth proper, to provide a planing.

iron, F, substantially oblong in form, and having its forward endbeveled and sharpened to providea cutting-edge, c. The cutting-edge ofthe planing-iron is thus in rear of the out ting-edge of the tooth, andalso extends or projects laterally from the tooth for the purpose ofplaning the kerf or slit made by the usual operation of the saw.

It will be seen that by constructing the teeth of thinner steel than theblade the planingirons formed on the teeth will have their cutting-edgesdirectly on a line with the face or side of said blade, and although theplaningiron will widen or increase the width or size of the kerf made bythe teeth, yet the kerf or slit made in or through the wood by both theteeth and the planing-irons will be no larger than the kerf made by thesaw without the planing attachment. I am not aware that such a saw hasheretofore been constructed to produce this effect, and I therefore wishto have it understood that I claim, broadly, this feature of the presentimprovement. It will also be seen that by forming the planing-irons withthe teeth of the saw (which, however, I do not claim, broadly) I amenabled to sharpen the planingirons and teeth together, thus avoidingthe trouble and saving the time employed in detaching the parts when theirons and teeth are formed separate and independent of each other.

The top edge of the recesses B is cut off at fin an inclined directionto provide a seat for the base of the planing-iron when the parts arefitted together.

The operation and. advantages of my invention will be readily understoodfrom the foregoing description, taken in connection with the annexeddrawings.

The planingiron and tooth being formed together,are inserted in placeand detached at the same time. When they are in proper position,theplaning-iron of one tooth projecting or extending out from one side andthe planing-iron of the next tooth projecting out from the oppositeside, and so on alternately around the periphery or edge of thesaw-blade, it will be seen that said irons will plane or smooth bothsides of the kerf or slit made by the teeth of the saw. Should it bedesired to plane only one side or wall of the kerf or slit,this can beeffected by changing the teeth so as to have all the planing-ironsextend out from that side of the teeth.

I would have it understood that I do not limit myself to mere details ofconstruction, as such may be varied at pleasure without departing fromthe spirit and scope of the present invention.

The improved form of teeth,made of thinner steel than the blade, may beused on a saw without the planing-irons, if so desired, and I blade, butform a closed wall, in combinationwith the'teeth having their shanksfitted within the recesses against the closed wall, said teeth beingpressed out on the same side as the closed wall to provide planing-ironswhich have their cutting-edges on a line with the face of the blade, asand for the purpose set forth.

2. In a saw, the teeth pressed out on one sideto provide a planing-ironthe cutting-edge of which is 011 a direct line with thefaceof thesaw-blade, as and for the purpose set forth.

3. .In a saw, the combination,withtheblade, of theplaning-ironshavingtheir cutting-edges 011 a direct line with the faceof the blade, as and for the purpose set forth.

4, In a saw, the combination,with the blade, of the herein-describeddetachable tooth,made of the same thickness th roughout,which thicknessis less than that of the blade, as and for the purpose set forth.

5. In asaw, the herein-described tooth,having its shank, body, andcutting-edge of the same thickness and of thinner steel than the blade,a portion of the tooth being pressed out on one side to provide aplaning-iron which has its cutting-edge on a line with the face of theblade, as set forth. 7

6. In a saw, the herein-described teeth,constructed of thinner metalthan the blade, and carrying planing-irons which have theircutting-edges on a line with the face of the blade, as and for thepurpose set forth.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

JOSEPH LEDNVARD.

Vitnesses:

EVERETT BARNS, LYNDON TAYLOR.

